I'm sorry -
I'm very sorry -
I'm really sorry -
Excuse me -
I apologize -
I beg your pardon -
I'm sorry I'm late -
Excuse me for being late -
Excuse me for a moment - ,
Sorry about yesterday -
I'm sorry, I forgot it - ,
I'm sorry, I forgot to call you - ,
I'm sorry, I forgot to call on you - ,
I'm sorry, I forgot to write you - ,
I'm sorry, I forgot to tell you - ,
I'm sorry, I forgot to pass the book to you - ,
I'm sorry, I forgot to answer your letter - ,
I'm sorry, I forgot to send you e-mail - ,
I apologize for losing my temper -
I'm sorry, I didn't mean to hurt your feelings - ,
It's all my fault -
Sorry, it's my fault - , ( , )
I'm sorry, I did it - ,
I'm sorry, I said it - ,
I'm sorry, I wrote it - ,
I'm sorry, I didn't do it - ,
I'm sorry, I didn't say it - ,
I'm sorry, I didn't write it - ,
I should have done it -
I shouldn't have done it -
It's all right - .
That's all right - .
It's OK - .
That's OK - .
That's quite all right - .
Never mind - .
Think nothing of it - .
It doesn't matter -
Don't worry (about it) - ( )
It's not your fault -
It's not important -
It's not so important -
Don't' worry. You couldn't help it - .
It doesn't' matter, honestly - ,
It's been a long time -
I haven't seen you for a long time -
I haven't seen you for ages -